Speed-changing device



E. 0. HEAD. SPEED CHANGING DEVICE.

APPLICATION FILED NOV. 10, 1917- Patented June 3 snans-smm m, ATTORNEYS.

Patented June 8, 1920.

3 SHEETS-SHEET 2.

AITOR/VEKS.

E C. HEAD.

SPEED CHANGING DEVICE.

APPLICATION FILED NOV. 10, MPH- Patented June 8, 19%.

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SPEED-CHANGING DEVICE.

Application filed. November 10, 1917.

To all whom it may concern:

Beit known that I, ERNEST 0. HEAD, a citizen of the United States ofAmerica, and a resident .of Van divert, Ohio, have invented a new anduseful Improvement in speed Changing Devices, which invention is fullyset forth in the following specification.

This invention relates to speed-changing devices for machine-tools, andwhile capable of use in a wide variety ofplaces, has especial utility incontrolling the table drive of a vertical. boring and turning mill.

An object of the invention is to provide a controlling device forspeed-changing gears which is simple in construction, eflicient inoperation, and easy of manipulation.

A further object of the invention is to provide a device of the typecharacterized that may be operated by the workman at l11S normalposition with respect to the machine and which will there indicate tosuch workman the precise position of the change-speed gears.

Another object of the invention is to provide-the movable members ofspeed-changing gears operatively-related in series with a controllingdevice comprising a single disk so constructed as to constitute aplurality of cams whereby the said speed-changing gears may be actuatedby the rotation of said single disk.

Other objects will appear as the description of the invention proceeds.

The invention broadly considered comprises, in a speed-changing devicefor machine-tools, change-speed gearing including a plurality of changegears operatlvely-related in series, and means for controlling the samecomprising a rotatable disk constructed to constitute a plurality ofcams and connections coacting with said cams and operatedby the rotationof said disk to selectively actuate said change-gears. In 1ts preferredembodiment, the changespeed gearing comprises a plurality of operativelyrelated gears a portion of which are shiftable to selectively engageother gears thereof, and said disk is provided on its opposed faces withcam grooves to shift said shiftable gears. Means are also preferablyprovided to indicate to the operator the position of said shiftablegears.

The invention is capable of receiving a variety of mechanicalexpressions, oneof which is shown on the accompanying drawings, but

Specification of Letters Patent.

Patented June 8, 1920.

Serial No. 201,244.

it is to ,be expressly understood that the drawings are for purposes ofillustration only andare nottobe construed as adefinitionof the limitsof the invention, reference being had to the appended claims for thatpurpose.

In said drawings Figure l is a sideelevation of a portion of averticalboring and turning mill equipped with a speed-changing device inaccordance with the present invention, the elements of said devicehaving surface shading applied thereto to distinguishthem from the otherelements of the machine;

Fig. 2 is an elevation of thelever elements of said device, the cam diskbeing shown in dotted lines;

Fi g. 3 is an elevation of one face of the cam disk;

Fig. 4 is aface view of the actuation box;

Fig.5 is a central vertical section of said box, showing thecam-actuating gears in elevation;

Fig. 6 is a side elevation of the gears contained in the speed box ofthe table drive;

Fig. 7 is a horizontal sectionthrough said speed box showing the gearsthereinin plan;

.Figs. 8 and ,9 are details of the speedchanging gears.

Referring in detail to said drawings, wherein the samereferencecharacters are used to designate corresponding parts throughout theseveral figures, the speedchanging device of the present invention isshown as applied to a vertical boring and turning mill, and particularlyto controlling the speed-changing gears in the drive of the table ofsuchmilhbut it is to be expressly understood that the invention is notlimited in its application to any particular form of machine-tool but iscapable of use in a wide. variety of places where speedchanging gears ofthe type in question are to be controlled.

In the form shown in Fi g. 7 1 is the drive shaft for driving the changespeed gears in the box 2, located in the embodiment illustrated at theextreme rear of the machine. Mounted for reciprocation upon said shaft 1within said box 2 are two gears ,3 and 4 which, together with the flange5, constitute a unitary gear member provided with a spline received inthe seat 6. Also mounted within the box 2 and parallel to the shaft '1are two shafts 7 and 8. Shaft 7 carries three gears 9, l0 and 11 fixedthereto. Gear 10 may mesh with gear 1 and gear 11 with gear 3. Mountedfor reciprocation on shaft 8 and splined thereto are two gears 12 and 13constituting a unitary gear member and designed to mesh with gears 9 and10 respectively. Gear members 3, 1 and 12, 13

together with the intermediate gears 9, 10,

' with a bracket 20 which supports rotatably a solid shaft 21 and atubular shaft 22, the shaft 21 being received within the bore of shaft22. Pinned to shaft 21 is'an arm 23 which at its opposite end isoperatively connected to rod 16. Mounted upon shaft 22 is a similar arm2st operatively connected at its opposite end to rod 17. Shafts 21 and22 are also provided at their opposite ends with arms 25 and 26respectively, carrying rollers 27 and 28 for coaction with the camgrooves 29 and 30. upon the opposed faces of a rotatable disk 31. Disk31 is therefore so constructedas to constitute a plurality of cams. 1Vhile the cams'are shown in the form of grooves in the opposed faces ofdisk ation they could be formed in the same face or could take the formof raised cam guides, or even cam faces. r

, am disk 31 is mounted on shaft 32which, in the form shown in Fig. 1,extends to the front of the mill where, in a position con venient to theoperators normal location, it is provided with a suitable operatingdevice and also, preferably, a suitable indi' cating device. In the formshown, .said shaft at its forward end carries a gear 33, which may be ahelical gear, contained within the actuation box 34. \Vithin said box isalso mounted a pinion shown as a helical pinion, in mesh with gear andcarried upon a shaft 36 which extends to the exterior of said box 34 andis there provided with. a suitable operating crank 37. Shaft 32 alsopreferably carries exterior-1y of the box 3 1 a pointer 38 for coactionwith suitable indicating characters on the cover 39 of said box. p V

In the embodiment of the invention illustrated on the drawings, theratio between operative positions to secure any one of the fourcombinations of said gears whereby the shaft.8 may be driven from theshaft 1 at any one of four different speeds. Thus the shaft 8 may bedriven from shaft 1 through any one of the" four following trains :gears3,11, 10, 13; gears '3, 11, 9, 12; gears 4-, 10, 13; gears l, 10, 9, 12.

Therefore it will be perceived that a speed-changing device formachine-tools has been provided comprising a minimum number of parts,and one that is both convenient of manipulation, owing to the locationof itsmanual operating-device at the operators station, and simple inconstruction, owing to its control of the, changespee'd gears from asingle disk so constructed as to constitute a plurality of cams.

lVhile the embodiment illustrated on the drawings has been describedwith considerable particularity, it is expressly understood that theinvention is not to be restricted thereto but is capable of receiving avariety of mechanical expressions, some of which will readily suggestthemselves to those skilled .in the art, while certain features thereofare capable of use without other features thereof. Furthermore, while inthe illustrated embodiment but two sets of shiftable gears have beencontrolled, it will be apparent that more thanv two sets may be shiftedby suitable modification of the controlling device. Reference istherefore to st. had to the claims hereto appended for a definition ofthe limits of the invention.

lVhat is claimed is r r 1. In a speed-changing device for machine-tools,a driven shaft, change-speed gearing in the drive of said shaft, saidchange-speed gearing comprising a plurality ofsimultaneously operativegear members having respectively a plurality of operative positions, andmeans to adjust said gear members to drive said shaft selectively atdifferent speeds, said adjusting means comprising a single rotatabledisk constructed to constitute a plurality of cams, connections wherebythe rotation of said cams shifts the respective gear members, and meansto rotate said disk.

2. In a speed-changing device for machine-tools, a driven shaft,change-speed gearing in the drive of said shaft, said change-speedgearing comprising a plurality of simultaneously-operative gear membershaving respectively a plurality. of operative positions, and means toadjust said gear members to drive said shaft selectively at differentspeeds, said adjusting means comprising a single rotatable disk havingits opposed faces constructed to constitute a plurality of cams,connectionswhereby the rotation of said cam shifts the respective gearmembers, and means to rotate said disk.

3. In a speed-changing device for machinetools, a driven shaft,change-speed gearing in the drive of said shaft, said change-speedgearing comprising a plurality of simultaneously-operative gear membershaving respectively a plurality of operative positions, and means toadjust said gear members comprising a single rotatable disk constructedto constitute a plurality of cams, means coacting with said cams anddirectly connected with the respective gear members to shift the same,and means to rotate said disk, the rotation of said disk selectivelyeffecting the movement of all said gear members to their severaloperative positions.

4. In a speed-changing device for machine-tools, a driven shaft,change-gears operatively-related in series in the drive of aid shaft andcomprising a plurality of members having a plurality of operatingpositions, and means for adjusting said members comprising a singlerotatable disk coir structed to constitute a plurality of cams, meanscoacting with said cams and connected with the respective members toactuate the same, and means to rotate said disk.

In a speed-changing device for ma chinetools, a driven shaft,change-speed gearing in the drive of said shaft comprising a pluralityof shiftable gear members, and means to adjust said gear memberscomprising a single disk mounted for continuous rotation in eitherdirection and constructed to constitute a plurality of cams, connectionswhereby the rotation of said cams shifts the respective gear members,and means to rotate said disk continuously in either direction.

6, In a speed-changing device for machinetools, a driven shaft,change-speed gen ring in the drive of said shaft comprising a pluralityof shiftable gear members, and means to adjust said gear memberscomprising a single disk mounted for rotation and constructed toconstitute a plurality of continuous cams, connections whereby therotation of said cams shifts the respective gear members, and means torotate said disk.

7. In a speedchanging device for machine-tools, a driven shaft,change'speed gearing in the drive of said shaft, said change-speedgearing comprising a plurality of simultaneouslv-operative gear membersrespectively having a plurality of operative positions, and means foradjusting said gear members comprising a single rotatable diskconstructed to constitute a plurality of cams, connections whereby thegearing in the drive of said shaft, said change-speed gearing comprisinga plurality of unitary gear members respectively having a plurality ofoperative positions, and means for adjusting said gear memberscomprising a single rotatable disk constructed to constitute a pluralityof arms, connections whereby the rotation of said cams shifts therespective gear members, and means to rotate said disk comprising amanually-operable device and speed reducing gearing between said deviceand said disk.

9. In a sped-changing device for machine-tools, a driven shaft,change-speed gearing in the drive of said shaft, said change-speedgearing comprising a plurality of shiftable gear members, rectilineallymovable elements for shifting the respective gear members, a singlerotatable disk constructed to constitute a plurality of cams, concentricshafts provided with arms operatively-related to said cams and said gearmembers, and means to rotate said disk.

10. I11 a speed-changing device for machine-tools, a driven shaft,change-speed gearing in the drive of said shaft comprising a pluralityof shiftable gear members, concentric shafts operatively connected tothe respective gear members, a single rotatable disk constructed toconstitute a plural.- ity of cams, operative connections between saidcams and the respective shafts, and means to rotate said disk.

11. In a speed-changing device for machine-tools having change-speedgearing remote from the operators normal position at the machine, saidchange-speed gearing comprising a plurality of shiftable gear members,means to adjust said gear members comprising a single rotatable diskconstructed to constitute a plurality of cams, connections whereby therotation of said. cams shifts the respective gear members, a shaft forrotating said disk extending to the operators position at the machine,means at said position for rotating said shaft, and means at saidposition for indicating the positions of said gear members.

12. In a speedchanging device for machine-tools having change-speedgearing remote from the operators normal position at the machine, saidchange-speed gearing comprising a plurality of shiftable gear members,means to adjust said gear members comprising a single rotatable diskconstructed to constitute a plurality of cams, connections whereby therotation of said cams shifts the respective gear members, a shaft forrotating said disk extending to the operators position at the machine, apointer on said shaft for indicating the positions of said gear members,and'means comprising speed-reducing gearing for rotating said shaft.

' cams shifts the respective gear members, and

means to rotate said disk,

14. In a speed-changing device for a boring mill having change-speedgearing in the table drive, said change-speed gearing comprising aplurality of simultaneouslyoperative gear members which have a pluralityof operative positions, meansfor adjusting said gear members comprisinga single rotatable disk constructed to constitute a plurality of cams,connections where- V by the rotation of said cams shifts the respectivegear members, and means to'rotate said cam. I

p In testimony whereof I have signed this specification. V

ERNEST C. HEAD.

